Changes to Table 4.............................................................................5
11/09—Rev. A to Rev. B
Changes to Figure 1 ...........................................................................1
Changed to Primary Side Supply Input Current, I
CC(DISABLE)
Maximum Limit to 2.5 mA ..............................................................4
Changes to Table 4.............................................................................5
Changes to Figure 13...................................................................... 11
9/08—Rev. 0 to Rev. A
Changes to Timing Parameters in Table 1 .................................... 3
Changes to Timing Parameters in Table 2 .................................... 4
Changes to Ordering Guide .......................................................... 14
7/08—Revision 0: Initial Version
Rev. G | Page 2 of 16
Data Sheet
SPECIFICATIONS
ADM3251E
All voltages are relative to their respective ground; all minimum/maximum specifications apply over the entire recommended operating
range; T
A
= 25°C and V
CC
= 5.0 V (dc-to-dc converter enabled), unless otherwise noted.
Table 1.
Parameter
DC CHARACTERISTICS
V
CC
Operating Voltage Range
DC-to-DC Converter Enable Threshold, V
CC(ENABLE) 1
DC-to-DC Converter Disable Threshold, V
CC(DISABLE)
1
DC-to-DC Converter Enabled
Input Supply Current, I
CC(ENABLE)
V
ISO
Output
2
LOGIC
Transmitter Input, T
IN
Logic Input Current, I
TIN
Logic Low Input Threshold, V
TINL
Logic High Input Threshold, V
TINH
Receiver Output, R
OUT
Logic High Output, V
ROUTH
Logic Low Output, V
ROUTL
RS-232
Receiver, R
IN
EIA-232 Input Voltage Range
3
EIA-232 Input Threshold Low
EIA-232 Input Threshold High
EIA-232 Input Hysteresis
EIA-232 Input Resistance
Transmitter, T
OUT
Output Voltage Swing (RS-232)
Transmitter Output Resistance
Output Short-Circuit Current (RS-232)
TIMING CHARACTERISTICS
Maximum Data Rate
Receiver Propagation Delay
t
PHL
t
PLH
Transmitter Propagation Delay
Transmitter Skew
Receiver Skew
Transition Region Slew Rate
3
AC SPECIFICATIONS
Output Rise/Fall Time, t
R
/t
F
(10% to 90%)
Common-Mode Transient Immunity at Logic High Output
4
Common-Mode Transient Immunity at Logic Low Output
4
ESD PROTECTION (R
IN
And T
OUT
PINS)
Min
4.5
4.5
Typ
Max
5.5
3.7
110
145
5.0
Unit
V
V
V
mA
mA
V
V
CC
= 5.5 V, no load
V
CC
= 5.5 V, R
L
= 3 kΩ
I
ISO
= 0 µA
Test Conditions/Comments
−10
0.7 V
CC
V
CC
− 0.1
V
CC
− 0.5
+0.01
+10
0.3 V
CC
μA
V
V
V
V
V
V
I
ROUTH
= −20 μA
I
ROUTH
= −4 mA
I
ROUTH
= 20 μA
I
ROUTH
= 4 mA
V
CC
V
CC
− 0.3
0.0
0.3
0.1
0.4
−30
0.6
+30
2.0
2.1
0.1
5
±5.7
±12
2.4
7
3
±5
300
V
V
V
V
kΩ
V
Ω
mA
kbps
R
L
= 3 kΩ to GND
V
ISO
= 0 V
460
190
135
650
80
70
10
R
L
= 3 kΩ to 7 kΩ, C
L
= 50 pF to 1000 pF
5.5
30
ns
ns
ns
ns
ns
V/μs
R
L
= 3 kΩ, C
L
= 1000 pF
+3 V to −3 V or −3 V to +3 V, V
CC
= +3.3 V,
R
L
= 3 kΩ, C
L
= 1000 pF, T
A
= 25°C
C
L
= 15 pF, CMOS signal levels
V
CM
= 1 kV, transient magnitude = 800 V
V
CM
= 1 kV, transient magnitude = 800 V
Human body model air discharge
Human body model contact discharge
2.3
25
25
±15
±8
ns
kV/μs
kV/μs
kV
kV
Enable/disable threshold is the V
CC
voltage at which the internal dc-to-dc converter is enabled/disabled.
To maintain data sheet specifications, do not draw current from V
ISO
.
3
Guaranteed by design.
4
V
CM
is the maximum common-mode voltage slew rate that can be sustained while maintaining specification-compliant operation. V
CM
is the common-mode potential
difference between the logic and bus sides. The transient magnitude is the range over which the common mode is slewed. The common-mode voltage slew rates
apply to both rising and falling common-mode voltage edges.
1
2
Rev. G | Page 3 of 16
ADM3251E
Data Sheet
All voltages are relative to their respective ground; all minimum/maximum specifications apply over the entire recommended operating
range; T
A
= 25°C, V
CC
= 3.3 V (dc-to-dc converter disabled), and the secondary side is powered externally by V
ISO
= 3.3 V, unless
otherwise noted.
Table 2.
Parameter
DC CHARACTERISTICS
V
CC
Operating Voltage Range
DC-to-DC Converter Disable Threshold, V
CC(DISABLE) 1
DC-to-DC Converter Disabled
V
ISO 2
Primary Side Supply Input Current, I
CC(DISABLE)
Secondary Side Supply Input Current, I
ISO(DISABLE)
Secondary Side Supply Input Current, I
ISO(DISABLE)
LOGIC
Transmitter Input, T
IN
Logic Input Current, I
TIN
Logic Low Input Threshold, V
TINL
Logic High Input Threshold, V
TINH
Receiver Output, R
OUT
Logic High Output, V
ROUTH
Logic Low Output, V
ROUTL
RS-232
Receiver, R
IN
EIA-232 Input Voltage Range
3
EIA-232 Input Threshold Low
EIA-232 Input Threshold High
EIA-232 Input Hysteresis
EIA-232 Input Resistance
Transmitter, T
OUT
Output Voltage Swing (RS-232)
Transmitter Output Resistance
Output Short-Circuit Current (RS-232)
TIMING CHARACTERISTICS
Maximum Data Rate
Receiver Propagation Delay
t
PHL
t
PLH
Transmitter Propagation Delay
Transmitter Skew
Receiver Skew
Transition Region Slew Rate
3
AC SPECIFICATIONS
Output Rise/Fall Time, t
R
/t
F
(10% to 90%)
Common-Mode Transient Immunity at Logic High Output
4
Common-Mode Transient Immunity at Logic Low Output
4
ESD PROTECTION (R
IN
AND T
OUT
PINS)
Min
3.0
Typ
Max
3.7
3.7
5.5
2.5
12
6.2
Unit
V
V
V
mA
mA
mA
Test Conditions/Comments
3.0
No load
V
ISO
= 5.5 V, R
L
= 3 kΩ
R
L
= 3 kΩ
−10
0.7 V
CC
V
CC
− 0.1
V
CC
− 0.5
+0.01
+10
0.3 V
CC
μA
V
V
V
V
V
V
I
ROUTH
= −20 μA
I
ROUTH
= −4 mA
I
ROUTH
= 20 μA
I
ROUTH
= 4 mA
V
CC
V
CC
− 0.3
0.0
0.3
0.1
0.4
−30
0.6
+30
1.3
1.6
0.3
5
±5.7
±11
2.4
7
3
±5
300
V
V
V
V
kΩ
V
Ω
mA
kbps
R
L
= 3 kΩ to GND
V
ISO
= 0 V
460
190
135
650
80
55
10
R
L
= 3 kΩ to 7 kΩ, C
L
= 50 pF to 1000 pF
5.5
30
ns
ns
ns
ns
ns
V/μs
R
L
= 3 kΩ, C
L
= 1000 pF
+3 V to −3 V or −3 V to +3 V, V
CC
= 3.3 V,
R
L
= 3 kΩ, C
L
= 1000 pF, T
A
= 25°C
C
L
= 15 pF, CMOS signal levels
V
CM
= 1 kV, transient magnitude = 800 V
V
CM
= 1 kV, transient magnitude = 800 V
Human body model air discharge
Human body model contact discharge
2.3
25
25
±15
±8
ns
kV/μs
kV/μs
kV
kV
Enable/disable threshold is the V
CC
voltage at which the internal dc-to-dc converter is enabled/disabled.
To maintain data sheet specifications, do not draw current from V
ISO
.
3
Guaranteed by design.
4
V
CM
is the maximum common-mode voltage slew rate that can be sustained while maintaining specification-compliant operation. V
CM
is the common-mode potential
difference between the logic and bus sides. The transient magnitude is the range over which the common mode is slewed. The common-mode voltage slew rates
apply to both rising and falling common-mode voltage edges.
京公网安备 11010802033920号
EEWORLD
